Artificially induced immunity to enzootic abortion in ewes.
D000034:Abortion, Veterinary / Q000276:immunology*; D000818:Animals; D002690:Chlamydia Infections / Q000276:immunology / Q000662:veterinary*; D003168:Complement Fixation Tests; D005260:Female; D011247:Pregnancy; D012756:Sheep; D012757:Sheep Diseases / Q000276:immunology*